have started in san francisco that want to find space, vehicles, tools, and everybody in the sharing economy saying we can actually plan with you not wait for disaster to hit. >> reporter: hurricane sandy last winter was the wake-up call for new york. >> the oceans are warmer so we would expect more storms and we have to be ready for that and we have 450 miles of coastline in new york city. and we need a lot of technology to figure out how to protect from waves, from high water, from winds and that kind of thing. >> reporter: both mayors say they do need more help from technology leaders so the first part of that technology summit will be held in new york this fall. the second part of that summit will be here in san francisco early next year. in san francisco, linda yee, kpix 5. >> there are 600 san francisco- based technology companies that already work together to help solve city problems such as education and immigration issues. >>> i would never want to witness that again. >> restaurant customers and workers terrorized by masked gunmen. why bay area police say they couldn't respond to th